---
schema_version: "1"
id: 49008cbeef5b8bdc17c8ce5add24ee23588063c1a50d1ce4ccff05ce8b08ca2a
title: HTTP 401 - Not Authorised
collection: tableau
version: next
locale: en-gb
portal_url: https://docs.salesforce.com/tableau/next/en-gb/server-linux/trusted_auth_trouble_401.md
canonical_url: https://help.tableau.com/v0.0/server-linux/en-gb/trusted_auth_trouble_401.htm
source_site: help.tableau.com
content_type: documentation
content_hash: 44ddcbe7adace731fbea46f1a738c53bf7832a3c19a054f4c46a322d6c94f709
description: Understand the HTTP 401 Not Authorized error in trusted authentication.
---
[Skip to main content](#main-content)

# HTTP 401 - Not Authorised

If you receive a **401 - Not Authorized error**, it could be for one of the following reasons: 

- You may have configured Tableau Server to use Active Directory with SSPI. If your web server uses SSPI, you do not need to set up trusted authentication. You can embed views and your users will have access to them as long as they are licensed Tableau server users and members of your Active Directory. For more information, see [tsm authentication sspi <commands>](https://help.tableau.com/v0.0/server-linux/en-gb/cli_authentication_tsm.htm#TSMSspi).
    
    **Note:** SSPI can only be configured on Tableau Server for Windows.
- Or a **302- Redirect error** after you have deployed Tableau Server, then it's likely the trusted ticket code you have written to construct the URL for the client has not been updated to account for the two-part ticket URL format. For more information, see [Get a Ticket from Tableau Server](https://help.tableau.com/v0.0/server-linux/en-gb/trusted_auth_webrequ.htm).